package org.json;

/*
 * Copyright (c) 2002 JSON.org
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * The Software shall be used for Good, not Evil.
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

import java.util.Iterator;

/**
 * Convert an HTTP header to a JSONObject and back.
 * 
 * @author JSON.org
 * @version 2010-12-24
 */
@SuppressWarnings("all")
public class HTTP {

	/** Carriage return/line feed. */
	public static final String	CRLF	= "\r\n";

	/**
	 * Convert an HTTP header string into a JSONObject. It can be a request
	 * header or a response header. A request header will contain
	 * 
	 * <pre>
	 * {
	 *    Method: "POST" (for example),
	 *    "Request-URI": "/" (for example),
	 *    "HTTP-Version": "HTTP/1.1" (for example)
	 * }
	 * </pre>
	 * 
	 * A response header will contain
	 * 
	 * <pre>
	 * {
	 *    "HTTP-Version": "HTTP/1.1" (for example),
	 *    "Status-Code": "200" (for example),
	 *    "Reason-Phrase": "OK" (for example)
	 * }
	 * </pre>
	 * 
	 * In addition, the other parameters in the header will be captured, using
	 * the HTTP field names as JSON names, so that
	 * 
	 * <pre>
	 *    Date: Sun, 26 May 2002 18:06:04 GMT
	 *    Cookie: Q=q2=PPEAsg--; B=677gi6ouf29bn&b=2&f=s
	 *    Cache-Control: no-cache
	 * </pre>
	 * 
	 * become
	 * 
	 * <pre>
	 * {...
	 *    Date: "Sun, 26 May 2002 18:06:04 GMT",
	 *    Cookie: "Q=q2=PPEAsg--; B=677gi6ouf29bn&b=2&f=s",
	 *    "Cache-Control": "no-cache",
	 * ...}
	 * </pre>
	 * 
	 * It does no further checking or conversion. It does not parse dates.
	 * It does not do '%' transforms on URLs.
	 * 
	 * @param string An HTTP header string.
	 * @return A JSONObject containing the elements and attributes
	 *         of the XML string.
	 * @throws JSONException
	 */
	public static JSONObject toJSONObject(String string) throws JSONException {
		JSONObject jo = new JSONObject();
		HTTPTokener x = new HTTPTokener(string);
		String token;

		token = x.nextToken();
		if (token.toUpperCase().startsWith("HTTP")) {

			// Response

			jo.put("HTTP-Version", token);
			jo.put("Status-Code", x.nextToken());
			jo.put("Reason-Phrase", x.nextTo('\0'));
			x.next();

		} else {

			// Request

			jo.put("Method", token);
			jo.put("Request-URI", x.nextToken());
			jo.put("HTTP-Version", x.nextToken());
		}

		// Fields

		while (x.more()) {
			String name = x.nextTo(':');
			x.next(':');
			jo.put(name, x.nextTo('\0'));
			x.next();
		}
		return jo;
	}

	/**
	 * Convert a JSONObject into an HTTP header. A request header must contain
	 * 
	 * <pre>
	 * {
	 *    Method: "POST" (for example),
	 *    "Request-URI": "/" (for example),
	 *    "HTTP-Version": "HTTP/1.1" (for example)
	 * }
	 * </pre>
	 * 
	 * A response header must contain
	 * 
	 * <pre>
	 * {
	 *    "HTTP-Version": "HTTP/1.1" (for example),
	 *    "Status-Code": "200" (for example),
	 *    "Reason-Phrase": "OK" (for example)
	 * }
	 * </pre>
	 * 
	 * Any other members of the JSONObject will be output as HTTP fields.
	 * The result will end with two CRLF pairs.
	 * 
	 * @param jo A JSONObject
	 * @return An HTTP header string.
	 * @throws JSONException if the object does not contain enough
	 *         information.
	 */
	public static String toString(JSONObject jo) throws JSONException {
		Iterator keys = jo.keys();
		String string;
		StringBuffer sb = new StringBuffer();
		if (jo.has("Status-Code") && jo.has("Reason-Phrase")) {
			sb.append(jo.getString("HTTP-Version"));
			sb.append(' ');
			sb.append(jo.getString("Status-Code"));
			sb.append(' ');
			sb.append(jo.getString("Reason-Phrase"));
		} else if (jo.has("Method") && jo.has("Request-URI")) {
			sb.append(jo.getString("Method"));
			sb.append(' ');
			sb.append('"');
			sb.append(jo.getString("Request-URI"));
			sb.append('"');
			sb.append(' ');
			sb.append(jo.getString("HTTP-Version"));
		} else {
			throw new JSONException("Not enough material for an HTTP header.");
		}
		sb.append(CRLF);
		while (keys.hasNext()) {
			string = keys.next().toString();
			if (!string.equals("HTTP-Version") && !string.equals("Status-Code") &&
					!string.equals("Reason-Phrase") && !string.equals("Method") &&
					!string.equals("Request-URI") && !jo.isNull(string)) {
				sb.append(string);
				sb.append(": ");
				sb.append(jo.getString(string));
				sb.append(CRLF);
			}
		}
		sb.append(CRLF);
		return sb.toString();
	}
}
